/*
 * Alloy Analyzer
 * Copyright (c) 2002 Massachusetts Institute of Technology
 *
 * The Alloy Analyzer is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * The Alloy Analyzer is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with the Alloy Analyzer; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package alloy.ast;

import alloy.util.Dbg;

public class IntNode extends TreeNode {

    /** the integer that it holds*/
    private int _number;

    /**
     * true if empty
     */
    private boolean _empty = false;

    public IntNode() {
	super(Location.UNKNOWN);
	_number = -1;
	_empty = true;
    }
    
    public IntNode(Location location_, int number_) {
        super(location_);
	_number = number_;
    }


    public IntNode(int number_) {
        super(Location.UNKNOWN);
	_number = number_;
    }



    /**
     * gets the int of this
     * @return the int
     */
    public int getInt() {
	Dbg.chk(!_empty, "attempt to use empty int");
        return _number;
    }

    /**
     * @return true if this is empty
     */
    public boolean isEmpty() {
        return _empty;
    }   

    /**
     * sets the int of this
     * @param int_ the new int for this
     */
    public void setInt(int int_) {
	Dbg.chk(!_empty, "attempt to use empty int");
        _number = int_;
    }

    
    /**
     * accept an AST visitor
     * @param visitor_ the visitor
     */
    protected void acceptVisitor(ASTVisitor visitor_) {
        visitor_.visit(this);
    }

    /**
     * accept a returning AST visitor
     * @param visitor_ the visitor
     * @return the Object returned by the visitor
     */
    protected Object acceptReturnVisitor(ASTReturnVisitor visitor_) {
        return visitor_.visit(this);
    }

    public String nodeString() {
        String ret = "";
        if (!_empty) {
            ret = Integer.toString(_number);
        }
        return ret;
    }

    public String toString()
    {
        return nodeString();
    }
    
}






